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  • Question

  • If the load doubled in value in the given circuit, what reflected resistance would the source see? 8

    If the load doubled in value in the given circuit, what reflected resistance would the source see?


  • Options
  • A. 80 Ω
  • B. 400 Ω
  • C. 2 kΩ
  • D. 10 kΩ

  • Correct Answer
  • 80 Ω 

    • Transformers problems

    Search Results

    • 1. What is the turns ratio of the transformer needed to match a 1 kΩ source resistance to a 160 Ω load?

    • Options
    • A. 2.5:1
    • B. 0.4:1
    • C. 6.25:1
    • D. 16:1
      • Discuss
    • 2. The coefficient of coupling between two coils is 0.45. The first coil has an inductance of 75 mH and the second coil has an inductance of 105 mH. What is the mutual inductance between the coils?

    • Options
    • A. 3.54 mH
    • B. 7.88 mH
    • C. 39.9 mH
    • D. 189.3 mH
      • Discuss
    • 3. Increasing the number of turns of wire on the secondary of a transformer will

    • Options
    • A. increase the secondary current
    • B. decrease the secondary current
    • C. have no effect on the secondary current
    • D. increase the primary current
      • Discuss
    • 4. A transformer has

    • Options
    • A. primary and secondary windings, both of which are considered inputs
    • B. primary and secondary windings, both of which are considered outputs
    • C. a primary winding used as an output and a secondary winding used as an input
    • D. a primary winding used as an input and a secondary winding used as an output
      • Discuss
    • 5. 

      What is the current through the load in the given circuit?


    • Options
    • A. 500 µA
    • B. 10 mA
    • C. 250 mA
    • D. 1.25 A
      • Discuss
    • 6. Mutual induction is dependent on

    • Options
    • A. winding ratios
    • B. output polarities
    • C. dc voltage levels
    • D. current changes
      • Discuss
    • 7. 

      What is the power dissipated in the primary of the transformer in the given circuit?


    • Options
    • A. 25 mW
    • B. 500 mW
    • C. 12.5 W
    • D. 62.5 W
      • Discuss
    • 8. A special transformer used to convert unbalanced signals to balanced signals is the

    • Options
    • A. balun
    • B. autotransformer
    • C. center-tapped transformer
    • D. step-across transformer
      • Discuss
    • 9. 

      What is the secondary voltage in the given circuit?


    • Options
    • A. 13.3 V rms in phase with the primary
    • B. 120 V rms in phase with the primary
    • C. 13.3 V rms out of phase with the primary
    • D. 120 V rms out of phase with the primary
      • Discuss
    • 10. When does maximum power transfer happen from the source to the load?

    • Options
    • A. When the source resistance is greater than the load resistance
    • B. When the source resistance is less than the load resistance
    • C. When there is negligible source resistance
    • D. When the source resistance equals the load resistance
      • Discuss

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